Generate schedule with different number of tables per round

[jpschewe]

Allow one to have a different number of tables for practice than for the performance rounds.

[jpschewe]

The challenge here is that the scheduler doesn't think about particular rounds when choosing a table. It just looks for an open slot at a time. If we really need this I may need to rework the scheduler to schedule each round separately in a time window.
Another possibility would be to block off a few tables during some time to block out the extra tables during the time that practice runs (for fewer during practice) or during the later rounds (for fewer tables during the regular performance rounds).